Pneumatic tire



.5 More particularly Patented Sept. 6, 1938 This invention relates toPATENT OFFICE PNEUMATIC TIRE I Theodore A. Rich],

foot Corporation, tion of Delaware Akron, Ohio, assignor to Wing-Wilmington, Del., a corpora- No Drawing. Application March 31, 1937,Serial No. 134,099

3 Claims.

an improved method of manufacturing pneumatic tires with artificialsilk. With such tires some adhesive should be employed to bond theartificial silk to the rubber.

treatment emulsion before applying excessive impregnation hesive andthis invention relates to the of the artificial silk fabric with an theadhesive to prevent of the fabric by the adto improve adhesion. Thetreatment may be applied to the artificialsilk threads but is preferablytherefrom.

applied to the cords or fabric made The adhesive. employed is of thelatex casein type. preferably The casein is present as a soluble salt,

sodium caseinate. No definite formula is required as the composition ofthe adhesive may of various be varied somewhat, as by the use of more orless latex or casein or by the addition ingredients. Gelatin and otherproteins may be used, altho casein will generally be preferred.low-boiling line.

The emulsion comprises water and a volatile oil such as benzene or gaso-A stabilized emulsion is preferred. Results obtained with emulsions whencompared with the use of-water or a volatile oil alone show that theemulsion is'superior.

values are fabric is obtained.

dries more Higher adhesion possible and a more flexible cord orFurthermore'the emulsion rapidly than water alone. With the preferredtype of emulsion it has been found possible to reduce without weakeningthe adhesion obtained. All of these are desirable features which theinvention makes possible.

10 parts of and .04 part gelatin.

this emulsion and while still wet gasoline, .40 part of ammonium oleateThe fabric is treated with is then treated with the casein-latexadhesive which may comprise 2 or rubber in EGOUSIY removed of sodiumcaseinate to 16% of Excess emulsion is advantaby an air jet beforeapplying 3% water.

the adhesive and excessive adhesive is advantageously r cord or fabemoved in a similar way. The treated ric is then dried. It may, forexample, 7

the amount of casein employed be dried for a few minutes, for exampleminutes, at a temperature in the neighborhood of 130 or higher and thensubsequently dried for 30 minutes at 250 F. This fabric is then builtinto the tire in the usual way with unvulcanized rubber adjacent thetreated artificial silk. This is then subjected to vulcanization asusual.

Instead of employing gasoline in th emulsion, benzene has been used.Other soaps than ammonium oleate may be employed although this soap wasfound quite satisfactory. Instead of stabilizing with soap and gelatineit was found that a small amount of a condensation derivative of rubberprepared according to Sebrell 2,052,423 (for example Pliolitemanufactured by The 15 Goodyear Tire 82 Rubber Company) gave goodresults. Water inethyl acetate with nitrocellulose as a stabilizer wasalso tried but was not found to be quite as satisfactory. With water andbenzene, saponin was found suitable as a stabilizer, 20 altho theemulsion was not quite as stable as that above referred to in thepreferred example. Any suitable means of stabilization may be utilized.

What I claim is: I

1. In the method of manufacturing pneumatic tires from artificial silkusing a casein-latex type adhesive to bond the artificial silk to therubber, the steps which comprise treating the artificial silk with anemulsion of water and a low-boiling volatile oil and then applying theadhesive while the artificial silk is still wet.

2. .In the method of manufacturing pneumatic tires from artificial silkusing a casein-latex type adhesive to bond the artificial silk to therubber, the steps which comprise treating the artificial silk with astabilized emulsion of water and gasoline and then applying the adhesivewhile the artificial silk is still wet.

3. In the method of manufacturing pneumatic tires from artificial silkusing a. casein-latex type adhesive .to bond the artificial silk to therubber, the steps which comprise treating th artificial silk with anemulsion of water and gasoline stabilized with ammonium oleate andgelatin and then applying the adhesive while the artificial silk isstill wet.

THEODOREA. RIEHL

